01838194

Component

https://doi.org/10.1177/03611981211072786

This paper describes a study conducted to quantify the potential environmental benefits of recycled asphalt pavement projects completed in Virginia. Three restorative maintenance projects were evaluated: (i) a 5-in. hot-mix asphalt (HMA) over 5-in. cold in-place recycling (CIR) with foamed asphalt stabilization; (ii) a 3.5-in. HMA over 5-in. CIR with emulsion stabilization; and (iii) one non-recycling structural overlay (5-in. HMA over an existing pavement). In addition, the following reconstruction projects—the first three constructed on primary roads and the last two constructed on interstates—were assessed: (i) a 2.5-in. HMA over 9.6-in. full depth reclamation (FDR) with asphalt stabilization; (ii) a 3.5-in. HMA over 9.0-in. cement stabilized FDR; (iii) a non-recycling reconstruction project (7-in. HMA over 12-in. aggregate base and subbase); (iv) a 6-in. HMA over 6-in. asphalt-stabilized cold central plant recycled layer over a 12-in. lime-stabilized FDR base; and (v) a non-recycling reconstruction project (8-in. HMA over 18-in. aggregate base and subbase). When considering exclusively cradle-to-laid system boundaries, the results show that pavement recycling projects used for interstate reconstruction and primary route restorative maintenance yielded lower global warming (GW) than non-recycling approaches. When considering the entire life cycle, the study found that approximately 98% of the total GW came from pavement–vehicle interaction that takes place during the use stage. Finally, to reduce GW, the Virginia Department of Transportation could encourage (or even incentivize) practices that improve the initial pavement smoothness for recycling projects and use structural designs that are expected to have a low annual deterioration rate.

Eugene Annan Amarh https://orcid.org/0000-0002-1571-7958 © National Academy of Sciences: Transportation Research Board 2022.

English

0000-0002-1571-7958

0000-0003-0337-8001

0000-0003-4440-0711

pp 75-86

2022-6

Transportation Research Record: Journal of the Transportation Research Board

Web

References (47)

Cold in-place recycling; Environmental impacts; Flexible pavements; Global warming; Rehabilitation; Sustainable development

Virginia

Environment; Highways; Materials; Pavements

TRIS, TRB, ATRI

Mar 4 2022 3:01PM

• Near Surface Pavement Response Using a Numerically Approximated Tire Contact Pressure From Inverse Analysis
• Using Probe-Based Speed Data and Interactive Maps for Long-Term and COVID-Era Congestion Monitoring in San Francisco